SQLMVED：基于多变体执行的SQL注入运行时防御系统

doi:10.11959/j.issn.1000-436x.2021046

Abstract

Abstract:

The effectiveness of combining SQL statement parsing with randomization to defend against SQL injection attack (SQLIA) was based on the fact that attackers did not know about the current method of randomization adopted by system.Therefore, once attackers had mastered the current method of randomization who can launch effective SQLIA.In order to solve this problem, a SQL injection runtime prevention system based on multi-variant execution was designed, the multi-variant apply randomization methods from any other, so that illegal SQL statements could not be parsed successfully by all variants.Even if attackers had mastered the method of randomization, illegal SQL statements could only be parsed successfully by a certain variant at most, meanwhile the parsing results of multiple variants were voted to find the abnormality in time and block attack path.The prototype system SQLMVED is implemented for Web services and experiments show that the prototype can effectively defeat SQLIA.

Key words: SQL injection attack, runtime prevention, multi-variant execution, randomization

CLC Number:

TP393

Bolin MA, Zheng ZHANG, Hao LIU, Jiangxing WU. SQLMVED: SQL injection runtime prevention system based on multi-variant execution[J]. Journal on Communications, 2021, 42(4): 127-138.

Figures/Tables 20

References 28

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攻击类型	攻击目标	示例
重言式	1)、2)	SELECT account FROM users WHERE login = ’zhangsan’ or 1=1-- ’ AND pass=’1234’;
批量查询	1)、2)、3)	SELECT account FROM users WHERE login = ’zhangsan’ AND pass=’ ’; drop table users -- ’;
错误回显	2)、3)、4)	SELECT account FROM users WHERE login = ’zhangsan’ AND (SELECT 1 FROM (SELECT count(),concat((SELECT account FROM users WHERE login = ’zhangsan’),floor(rand(0)2))x FROM users group by x)a)-- ’ AND pass=’1234’；
联合查询	1)、2)	SELECT account FROM users WHERE login = ’zhangsan’ UNION SELECT * FROM users WHERE login = ’zhangsan’ -- ’ AND pass=’1234’;
存储过程	1)、2)、3)	CREATE PROCEDURE DBO.isAuthenticated
		@userName varchar2, @pass varchar2, @pin int AS
		EXEC(’’SELECT accounts FROM users WHERE login=’’’ +@userName+ ’’’ AND pass=’’’ +@password+ ’’’ AND pin=’’+@pin); GO
盲注	2)、4)	布尔盲注(bool blind injection)
		SELECT account FROM users WHERE login=’zhangsan’ AND SELECT length(database())>n-- ’ AND pass=’1234’;
		时间盲注(time blind injection)
		SELECT account FROM users WHERE login=’zhangsan’ AND if(length(database())>=8,sleep(5),1)-- ’ AND pass=’1234’;
交替编码	5)	SELECT account FROM users WHERE login=’zhangsan’; exec(char(0x73687574646f776e)) -- AND pass=’’;

架构		操作系统	服务器	中间件	数据库
LAMP		CentOS	Apache	php-fpm	MySQL
	用户请求代理	CentOS	Nginx	python	—
	E₁变体	CentOS	Apache	php-fpm	—
本文架构	E₂变体	CentOS	Apache	php-fpm	—
	E₃变体	CentOS	Apache	php-fpm	—
	数据库代理	CentOS	—	sqlparse python	—
	数据库	Windows10	—	—	MySQL

应用程序	注入点	LAMP架构	SQLMVED架构
	GET/Search	×	√
	POST/Select	×	√
	Login Form/Hero	×	√
	Drupal	×	×
	Stored User-Agent	×	√
	Blind Time-Based	×	√
	GET/Select	×	√
	AJAX/JSON/jQuery	×	√
bWAPP 2.2(Low)	Login Form/User	×	√
	Stored Blog	×	√
	Stored XML	×	√
	Blind SQLite	×	×
	POST/Search	×	√
	CAPTCHA	×	√
	SQLite	×	×
	Stored SQLite	×	×
	Blind Boolean-Based	×	√
	Blind Web Services/SOAP	×	√
DVWA 1.9(Low)	sqli	×	√
	sqli_blind	×	√
	Error Based- String(GET)	×	√
	Error Based- DoubleQuotes String(GET)	×	√
	Dump into Outfile(GET)	×	√
	Blind- Time based- Double Quotes- String(GET)	×	√
	Double Injection- String- with twist(POST)	×	√
	Blind- Time Based- Double quotes- String(POST)	×	√
	Header Injection- RefererError Based- string(POST)	×	√
	Error Based- Intiger(GET)	×	√
	Double Query- Single QuotesString(GET)	×	√
SQLI-LABS (Less 1~ 20)	Blind- Boolian- Single QuotesString(GET)	×	√
	Error Based- String(POST)	×	√
	Double Injection- Double quotes- String(POST)	×	√
	Update Query- Error based String(POST)	×	√
	Cookie Injection- Error Basedstring(POST)	×	√
	Error Based- String with Twist(GET)	×	√
	Double Query- Double QuotesString(GET)	×	√
	Blind- Time based- Single Quotes-String(GET)	×	√
	Error Based- Double quotesString(POST)	×	√
	Blind- Boolian BasedString(POST)	×	√
	Header Injection- Error Basedstring(POST)	×	√

类型	测试语句
读数据	SELECT account FROM users WHERE login='test' AND pass='1234';
写数据	UPDATE users SET account=92 WHERE login='test' AND pass='1234';

SQLMVED: SQL injection runtime prevention system based on multi-variant execution

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